Electric fuse.



T. E. MURRAY, JR.

ELECTRIC FUSE.

APPLICATION FILED MAR 28, 1912.

Patented Dec. 21, 1915.

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UNITED STATES IPATENT OFFICE.-

THOMAS E. MURRAY, m, or BROOKLYN, NEW YORK, ASSIG'NOB 'ro rnomas n.

MURRAY, or unwxonx, N. Y.

'minc'rnrc ruse.

Specification of Letters latent.

Application filed March 28, 1912. Serial No. 686,813.

To all whom it may concern:

Be it known that I, THOMAS E. MURRAY, Jr., a citizen of the United States, residing at Brooklyn, in the county of -Kings and State of New York, have invented a certain new and useful Improvement in Electric Fuses, of which the following is a specification.

The invention relates to electric fuses, and has for its object to facilitate and cheapen the assembling of the device because it ena'bles'soldered joints to be used without requiring soldering to be done within the plug; while at the same time it preserves the advantages of plugs having low resistance terminals extending within the inclosure.

In' the accompanying drawings Figure 1 is an outside view of a fuse plug embodying my invention. Fig. 2 is a diametral section thereof, and Fig. 3 shows the shunt strip separately and in perspective.

Similar letters of reference indicate like parts.

A is a cylindrical fuse plug of refractory material, such as porcelain, having the usual threaded metal sleeve or shell terminal B, to which one end of the fuse strip C is connected, at D, by solder or otherwise. The other end of the fuse strip is secured to a contact terminal E on the bottom of the plug. Preferably, the contact plate E has two flexible arms E which, after insertion through an opening, are spread to hold said contact plate in place. The end of the fuse strip is then soldered, at G, between said arms.

.H is a strip of conducting material, having at one end a notch I and suitably bent to conform to .the thread on the outside of the plug, and to be held thereon by the shell B. The strip H and the fuse C preferably pass through the same opening J in the wall of the plug. The strip H protrudes into the space within the plug, and near its notched end is preferably curved down- ,wardly so as to bring the notch I in such a position as that the fuse strip C will be supported snugly in said notch. The fuse strip within the plug is thus kept taut and straight. The strip H forms a shunt between the point where it makes electrical connection with the fuse strip C (namely, at the notch I) and the point D where the fuse strip C makes electrical connection with shell B.

After the parts have been assembled, asv

described, the fuse strip C and shunt H are embedded in refractory insulating material K, such as marble dust, and the top of the fuse chamber and the passage through the wall of the plug are closed by a body of plaster L introduced while plastic and al-* lowed to harden. By reason of this con Patented Dec. 21, 1915. I

so i

struction, blowing of the fuse-overthat part of it included between notch I and shell B is prevented, and limited to the remaining part included between. notch I and the point r G, where the fuse is connected to arms F. Both of these points are within the fuse plug. Hence, the flame of explosion is confined therein, and adjacent objects are not endangered thereby.

I claim:

1. A hollow "fuse plug, terminals on the exterior thereof, a fuse strip connected at its ends to said terminals and forming a loop within said plug, and astrip of conducting material supporting said loop and connected to one of said terminals. p

2. A. hollow fuse plug having an opening in its wall, terminals on the-exterior of said plug, a fuse strip within said plug connected at its ends to said terminals and passing through said plug opening, and a strip of conducting material connected at one end to said fuse strip within said plug, passing through said plug opening and connected at its other end to one of said terminals.

3. A hollow fuse plug, terminals on the I A hollow fuse plug, terminals on the- 2 menus exterior thereof, a. fuse strip connected at its In testimony whereof I have nflixed my ends to said terminals and forming a loop signature in presence of two witnesses,

.within said plum and nflexible strip of con; [UR ducting material connected at one end to THOBIAS RAY one of said plug terminals andat its other V Witnesses:

end adjustable to support said strip at n GERTRUDE T; PORTER, selected point thereon. Mm: T. MCGARRY. 

